Change-speed gear.



No. 894,827. PATENTBD JULY 28,1908. J. JOHNSTON 8 H. W. BUDDJCOM.

CHANGE-SPEED GEAR.

APPLICATION FILED MAY 9. 1805.

3 SHEETS-SHEET 1.

No. 894,327. PATENTED JULY 28, 1908. J. JOHNSTON & H. W. BUDDIGOM.

3 SHEETS-SHEET 2.

PATENTED JULY 28, 1908.

J. JOHNSTON & H. W. BUDDICOM.

CHANGE SPEED GEAR. APPLIUATION HLED MAY 9. 1905.

3 SHEETS-SHEET 3.

Y V V E s E" 7 V O V ,W w

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UNITED sTATEs PATENT OFFICE.

JOHN JOHNSTON, OF PUTNEY, LONDON, AND HARRY WILLIAM BUDDIOOM, OFNANNERGH, I l

NEAR MOLD, ENGLAND.

CHANGE-SPEED GEAR.

specification'of Letters Patent.

Patented July 28, 1908.

To all whom it may concern:

Be it known that we, JOHN JOHNSTON and HARRY WILLIAM BUDDIOOM, subjectsof the King of Great Britain and Ireland, and residing at 3 RuvignyMansions, Putney, London, S. W., England, and Penbedw, N annerch, nearMold, in the county of Flint, North Wales, respectively, have inventedcertain new and useful Improvements in Change- Speed Gear, of which thefollowing is a specication. This inventionl relates to change speed gearfor use upon motor driven vehicles and other purposes and of the t pewherein the power from the motor shaft 1s transmitted to the drivenshaft through sets of sun and planet gear of diHerent values some of thefrom the motor shaft to the driven shaft for the highest speed istransmitted' through a clutch mounted on one of the elements `of thegear which will cause the latter to rotate en bloc l when the clutch isengaged,

' while the lower speeds and reverse are obtained through sets of sunand planet mo- Y tions preferably in the form of bevel sun for carryingthe wheels and bevel planet` inions, some of the sun Wheels bein provied. with brake surfaces by which t iey may be held stationary orretarded to effect the desired change in speed or direction. The sunwheels are provided with com aratively long hub sleeves brakes so thatall the wheels and pinions may be incased in a compact manner Within anoil tight casing, the brakes and the clutch being outside the same.

In the accompanying drawings, Fi res 1 and 2 are'respective ylongitudinal an transverse sections of a gear accordin to the invention,Fig. 3 is an end view part y in section showing the clutch-operatingmechanism. n

In carrying out the invention according to one mode as i'n theapplication to a three speed and reverse gear, a small sun bevel wheelor sun pinion, af, is keyed or pinned to the driving shaft, b. A secondsun bevel wheel or pinion c of equal diameter but with teeth oppositelyarranged in relation to the first a, 1s loosely mounted on the sameshaft b. These two sun wheels a and. c are hereinafter referred toas thefixed and loose sun pinions respectively. Upon the outer end oftheextended hub sleeve dyof the loose sun pinion c is rigidly mounted oneelement e of an ex anding or other olutch forming also a` bralie drumhereinafter referredl to as the second speed drum,'preferably acting asa brake drum `on its outer periphery and a' clutch surface on its innerperiphery adapted to be engaged by a clutch member f on the drivingshaft b. Loosely mounted on the same journal d is a sun wheel g, alsohaving a brake ldrum h, rigidly mounted on its extended hub sleeve, thisdrum being hereinafter referred to as the third speed drum. A sun wheeli, of equal diameter to the one g just referred to but with oppositelyarranged teeth is loosely mounted at the opposite side of the gear andhas a brake drum lf on its hub sleeve, referredto hereinlafter as thereverse-drum. The latter sun wheel i runs loosely Ona sleeve Z which ispinned or keyed to the' driven shaft m and 1s loose;on the driving shaftab.' From this sleeve l a number of radiating arms or a concave disk nextends having `a circumferential flange to'which the collars o areattached by screws 9, the collars embracing the ends of radial pins 1'on which latter double planetI pinions p, g, are mounted.

The planetpiruons are ada ted to engage and connect thev sun whees andpinions, and the radial arms or concave disk n forms a driving memberfor transmitting the torque from the planet inions to the driven shaft.or in pairs, the pinions of each pair being rigidly secured together bya sleeve. That is, each has a pinion p meshing between the two sunwheels g and i, and va pinion g meshing between the sun pinions c and a.The planet pinions are as before stated supported on radial pins 1'.carried by or extending from a collar s loosely mounted on the hubsleeve t ofthe fixed sun pinion, a, the planet pinions running looselyon the pins. The Whole of the gearing 1s in- The planet pinions aredouble casedby asuitable oil-tight casing u, so that it runscontinuously in an oil bath.v

In operation the highest speed is obtained' "by engaging the clutch f,e, when the gear rotates en bloc. and the fdriven shaft m has the samespeed as the I'notor shaftb. For the second speed the clutch is releasedand the brake applied to the second s eed drum e. This retards -or holdsthe oose sun pinion c stationary and ,the fixed sun pinion a drives theplanet pinions g and causes them to make an orbital movement resultingin-a somewhat lower speed ofthe driven shaft m in the aheaddirection.The third speed ahead is obtained by releasing the second speed drum eand apbplying the brake to the third speed drum to retard or hold theloose sun wheel g stationary.

' driven shaft m.

' fi stationary `so that alt The fixed sun pinion a still imparts 'anspeeds can be'applied as desired Without passing through the others inrotation.v It is to be. understood that thenumbei' of sets of planetpinions and sun wheels maybe varied to suit the number of speedsrequired and l that the invention is not yconfined to .the

exact method of mounting the gears hereinbefore referred to by way ofexam le.

A convenient formof clutch is illustrated in Fi land 3. The ex andingring f is 'split iametrically, and at t e split ends, has

lu s v v screw-threaded to receive right and le t hand threaded ins w w,double threads being preferred.` he p'ins ware provided with ratchet ornotched collars :I: rigidly mounted thereon. Small levers y are looselymounted on the collars x but are adjustably secured thereon by feathersz. Initial adjustment is effectedby removing the bolt 7 and sideplatesSand then slipping the levers y "off the notched collarsx, rotatingl thesame until another notch in each comes opposite its respective featherwhen the levers andl lates can be replaced. The llevers y are linked toradial arms 2 rigidlymounted on a collar( 3 keyed but adaptedto slide onthe driving shaft b. y The parts of the expanding ring f also have lugs4 Whichengage within the ends of the radial arms 5 extending fromthehubsleeve 6.

The clutch is engaged by sliding the collar 3 in the direction indicatedby the arrow which results in a'n expansion of the ring f, an oppositemovement of theI collar 3 effecting a contraction'of the ring andtherefore release of the clutch. A y

Having thus described our invention, what we claim as new and desire tosecure by Letters Patent is N A change speed gear comprising a drivingshaft, two sun bevel pinions, one loose on and one keyed to, the drivingshaft, sun bevel wheels loosel mounted and having concave webs and seeves integral with .said webs, a sleeve integral with the loose sunpinion, planet pinions meshing with the sun wheels and pinions, radial`i'ns for said planet inions, a concave mem er keyed to the riven shaftand having bosses for supportin `the outer ends of the pins, asleeve'integra with the inner ends of the latter, a light casinginclosing the gear wheels and pinions, and brake drums outside the casinand mounted on the sleeves of the sun whee s and of tlie loose sunpinion, said sleeves extending through said casing, substantially ashereinbefore set forth. t .In witness whereof I the said JOHN JOHN- sToNhave signed my-name tothis specification in the presence of twosubscribing witnG/SSGS.

, JOHN JOHNSTON. Witnesses:

FRANCIS J. BIGNELL, BERTRAM H. MATTHEWS'.

Iii witness whereof I the saidl HARRY WiL- LIAM BUDDIcoM have signed myname to this specification in the presence of two subscribing witnesses.

HARRY WM. BUDDIOOM.

Witnesses: O. W. DIGBY, ALBERT AMEGLIO.

